Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)

This error message usually occurs when another process is using the package management system (apt) at the same time. To resolve this issue, you can try the following steps:

1. First, make sure that no other package management processes are running in the background. You can check this by running the following command:

   ps aux | grep -i apt

This will show any running processes related to apt. If you find any, you can use the `kill` command followed by the process ID (PID) to terminate them.

2. If there are no other processes using apt, you can remove the lock files by running the following commands one by one:

   sudo rm /var/lib/apt/lists/lock
   sudo rm /var/cache/apt/archives/lock
   sudo rm /var/lib/dpkg/lock*

3. Once the lock files are removed, you can try updating your package lists again using the following command:

   sudo apt update

If the error persists, you may need to restart your system and then try updating the package lists again.

I hope this helps! Let me know if you have any further questions.